What is sexual energy other than a basic creative type of energy? In its raw form, sexual energy has nothing to do with intercourse, orgasm, or physical procreation. Only after sexual energy has been utilized by the lower centers/chakras does it then manifest as physical libido.
But it can also instead be utilized by the higher centers for higher types of creation. For example, instead of creating a child, you can create a brain-child, which is sexual energy expressed on the intellectual rather than physical level.
Any creative act requires sexual energy, but sexual energy in itself merely embodies the archetype of creation and nothing more. In other words, by the time you feel a physical sexual urge, sexual energy has already been diverted to the lower centers.
The more time you spend creating on a higher level, the more sexual energy is diverted to the higher centers and thus the lower the physical expression of sexual energy. Some religions advocate the repression of physical sexual energy rather than its transmutation through diversion to the higher centers, which only causes the energy to build until it ruptures in perverted ways.
As for kundalini, premature awakening is associated with spontaneous human combustion and insanity. How? For the same reason that too much resistance in a wire cause it to heat up when current is pumped through, and that a circuit will malfunction if it's given more current than it can handle.
Simply doing kundalini raising exercises won't improve the energy circuits and conduits of your body, so when you do turn on the switch prematurely it won't be fun. From what I gather, kundalini energy is what happens when the sexual center (the chakra that draws in raw sexual energy from the universe) is turned on full blast and connected directly to all the centers of your body.
The caveat is this: any center connected to this energy which has imbalances will express the energy in an unbalanced way, hence the insanity and emotional destabilization risk. But even more important is this: the Ra material explains that the crown chakra, or the violet ray energy as Ra calls it, can only be balanced as a sum total balance of all the other chakras, which can only be achieved through direct spiritual evolution and progress. In other words, meditation, energy work, ritual, and visualization alone won't accomplish this because those are merely conditioning rather than evolving mechanisms.
So I don't think there is any shortcut for using activated kundalini energy in an ideal manner. Any premature attempts will either channel this energy into unbalanced centers, or else will only cause a trickle of kundalini to flow.
But many people who are into the kundalini raising stuff are only in it for the experience, so if they get a trickle of energy activating their lower centers, along with all sorts of interesting sensations and random telekinetic phenomena, then they're happy. Sort of like peeing on an electric fence, if you think about it.
Acquiring fringe knowledge is like digging for diamonds in a mine field.